mineral
Green Aventurine
Quartz variety (SiO2 with inclusions)
Hardness: 7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It is characterized by aventurescence, a shimmering effect caused by platy inclusions of fuchsite mica.
- Hardness
- 7 on Mohs scale
- Color
- Pale green to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale green to forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal (often massive); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It is characterized by aventurescence, a shimmering effect caused by platy inclusions of fuchsite mica.
Formation & geological history
Formed in metamorphic rocks and magmatic environments where silica-rich fluids permeate through rock cavities. Its characteristic inclusions are usually mica (fuchsite) or hematite/goethite, which grow within the quartz matrix during formation.
Uses & applications
Widely used for cabochons, beads, ornamental carvings, clock faces, and tumbled stones for aquarium decoration and metaphysical collections.
Geological facts
Aventurine is often mistaken for jade due to its color, but it is much harder. The name 'aventurine' is derived from the Italian word 'a ventura', which means 'by chance', originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century.
Field identification & locations
Identified by its distinctive speckled green appearance and shimmering mica plates when held under a light. Frequently found in India, Brazil, Russia, and Tanzania. For collectors, check for the metallic sparkles of chrome-mica to distinguish it from green glass or jadeite.
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